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[Bug optimization/12324] [3.4 Regression] [unti-at-a-time] not emitting function referenced from a compound statement
- From: "hubicka at ucw dot cz" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Sep 2003 08:43:45 -0000
- Subject: [Bug optimization/12324] [3.4 Regression] [unti-at-a-time] not emitting function referenced from a compound statement
- References: <20030918042646.12324.bernie@develer.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12324
------- Additional Comments From hubicka at ucw dot cz 2003-09-26 08:43 -------
Subject: Re: [3.4 Regression] [unti-at-a-time] not emitting function referenced from a compound statement
> PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12324
>
>
>
> ------- Additional Comments From bernie at develer dot com 2003-09-25 20:48 -------
> Not sure if it's the same bug, but 3.4 outputs
> nothing for this code with -O2:
>
> static int foo __attribute__((unused)) = 42;
>
> This breaks the Linux kernel (the __setup() macro).
> GCC 3.3.1 did the right thing:
>
> .data
> .align 4
> .type foo, @object
> .size foo, 4
> foo:
> .long 42
You shall use attribute used here. Attribute unused merely supress the
warning, while attribute used makes it to be output. I will look into
the other problem.
Note that attribute used did not work for variables for older GCC, so
you need ifdef machinery.
Honza
>
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